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Questions tagged [torque]

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0
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1answer
40 views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
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0answers
17 views

Asynchronous motor with FOC control and torque constant

So, I am studying an application with an asynchronous motor. Attached to the motor i find a driver and the control of the motor is based on the calculation of an equivalent torque constant for the ...
0
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1answer
59 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
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0answers
29 views

Can I operate my (typical) 8mm Bipolar stepper like a BLDC?

My project involves use of these tiny steppers in an open loop- I'm not yet certain whether I can get away with the torque compromise that microstepping would require but it would be desirable. ...
0
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0answers
18 views

How to add back emf as part of this sinusoidal commutation equation

I recently found a nice article on sinusoidal commutation which has a simple exposition of the subject. The torque is derived from first principles but the equation seems not to include BEMF. Does ...
2
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0answers
25 views

BLDC motor poles versus Torque and RPM

How to calculate the cost of a BLDC motor? Assume I need 24 stator coils of height 10 mm and width 5 mm. Is there any formula for torque comparison with increasing the number of poles?
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2answers
51 views

Estimating torque of AC motor

Given voltage, measured current draw, and RPMs of an AC motor, and an estimated efficiency rating, is it possible to calculate the actual instantaneous output torque? Or is other information required? ...
0
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0answers
17 views

Phase voltage and torque of stepper motor

When I use a chopper type driver for drive a stepper motor how it effect the rated phase voltage? Is there any relation between rated phase voltage and running torque of the stepper?
0
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1answer
42 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
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0answers
37 views

Is using an external capacitor in a slip ring induction motor viable for increasing it's starting torque?

I've been reading about slip ring induction motors lately and several sources, including Wikipedia and LearnEngineering (a YouTube channel), mention that adding an external resistance will increase ...
1
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1answer
71 views

Problems calculating torque for a motor opening a door

I want to make a device that can open a door from a cabinet. The door is about 4 meters wide and about 0.5 meters high. (if the width causes a problem I can split it in 1 meters section with one motor ...
0
votes
1answer
35 views

Motor selection for high speed rotary actuation

I am trying to select a motor for a high-speed application where I need to rotate a load bearing cylindrical disc at 20,000 rpm. The total mass of the disc along with its load is approximately 1.5 - 2 ...
0
votes
1answer
207 views

Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as ...
1
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3answers
64 views

Difference between lower and higher current rated ESCs and electric skateboard questions

I am starting a project and would like to build an electric skateboard. Here are the specs for the parts that I have gathered so far: a. Two 90mm wheels that each contain a built-in BLDC motor. The ...
0
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0answers
173 views

Run Stepper motor with more torque and smoothly

I have a stepper motor and its torque curve is below. I am trying to get more torque from the motor. Therefore, I decided to setup my driver to half step. I am using an Arduino for generate the ...
0
votes
1answer
56 views

About the torque of mini servo motor

I'd like to automate button pressing on Nintendo DSi for a certain purpose. For this, I think I will use a raspberry pi and a mini servo motor SG-90. My question is, would the SG-90 would give ...
2
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2answers
111 views

What is torque-ampere ratio at electric machines? How it is related with machine efficiency?

When I am reading a journal about SRM (switched reluctance machines) it said that outer rotor design has better efficiency due to higher torque ampere ratio. How it is related with efficiency?
1
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4answers
180 views

Induction Motor Torque Slip Characteristics

This question was asked in a interview for Scientist position. For a given T-slip characteristics of an induction motor, I want the same maximum torque but at a lower slip value? Is it even possible?...
0
votes
1answer
87 views

How can I decrease the torque of a stepper motor?

I would like to take a powerful stepper motor, and sometimes weaken it, so it will stall when it hits resistance. I understand that I can reduce torque with microstepping, but it does not seem to be ...
1
vote
1answer
335 views

12 Volt vs a 24 Volt Motor

I have read that using a higher voltage motor would need less current to get the same power. I understand that P = IV and how that works. My question is if the 24 V motor would get half of the current,...
0
votes
1answer
24 views

DC motor selection criteria: number of poles

I’m designing a system to measure an arbitrary motor torque curve. As an active load, I’m searching for a brushed DC motor that is able to withstand some degree of torque and speed as well as comply ...
1
vote
1answer
151 views

stepper motor constant speed under load?

Before posting this question I've been looking up google but can't find an answer to this question other than "speed control and torque control". I've done a lot of research on steppers but still don'...
1
vote
1answer
229 views

Locked Rotor Torque

Hi All I am try to produce a torque curve using the standard torque equation, using the parameters given by the manufacturer as in the attached picture. $$Torque =\dfrac{1}{\omega_s}\cdot\dfrac{V_1^...
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1answer
71 views

Load torque and Rotor torque

What would happen if the load torque became greater than the rotor torque developed by the motor?
0
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0answers
29 views

FIT0186 Torque calcution

I am trying to find a strong motor which can deliver a torque at least 0.2Nm and around 130RPM. While trying to find a 6mm shaft geared motor with feedback,the required torque and rotational was ...
1
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0answers
218 views

Meaning of motor constants for three-phase PMSM

When looking at three-phase permanent magnet synchronous (brushless) motors, \$K_T\$ and \$K_V\$ numbers are often specified. Also, controllers for these motors typically specify maximum currents. ...
-3
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1answer
80 views

How do I know what the max volts and amps for this motor [closed]

Got it from the brush roller in a shark vacuum
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0answers
64 views

Using a 670Kv outrunner motor, how can I calculate a way to get variable low speed and high torque?

I have an E-flite Power 46, 670Kv outrunner motor (Kv is the shorthand for RPM/volts, it has 3.9A idle current, 40A maximum continuous current, 14.4-19.2 voltage range, 925 watt maximum) but I wish to ...
0
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0answers
69 views

Experimental calculation of torque constant

I would like to calculate the power consumption of a motor: Pm=(ImNτ2pi)/60 where Pm is the power consumption of the motor (mW), Im the electric current used to drive the motor (amps), N the ...
0
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0answers
49 views

dc motor calculation

I'm having trouble with this problem. Suppose the machine was at rest, and a weight of 5 kg was suspended from a horizontal bar of length 80 cm attached to the shaft. What current must be applied to ...
0
votes
1answer
488 views

Tension control using a DC motor

I would like to control the tension of a string attached to the armature of a DC motor. I think the StackExchange thread here does not fully answer my question. Here the schematic (pencil sketch) of a ...
0
votes
0answers
79 views

finding air gap shear stress in a permanent magnet generator

I have found that the air gap shear stress is a limiting factor when sizing a generator, but how do I find the value for it?
0
votes
1answer
127 views

gear motor can be used as generator

I am in doubt with a motors operation, I am not sure whether this question could be asked here, I have a car wiper motor with two speed operation,It uses a PM dc motor with worm gear inside, so it is ...
0
votes
1answer
976 views

is there a calculation for no load current on BLDC motor?

I am calculating various values for a range of motors. However, I need to find the no load current of a motor or io to allow me to calculate other values, based on the information I have below for a ...
0
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2answers
238 views

Decrease torque of an electric motor

I got this automatic antenna for a project, but the torque is a little too high. It runs on 12V. I've figured the way it works is, it knows to stop when the load increases to a certain point (i.e. ...
0
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0answers
156 views

machines 3 phase induction motor

The full load torque of a 3 phase 400 V, 50 Hz,4 pole induction motor is 48 Nm. The motor draws a phase current of 6.61 A. The rotor resistance per phase is referred to stator is 5 ohm. Neglecting ...
1
vote
0answers
60 views

Stepper motor torque requirements

I have a robot that has a load of 60kg and it has to move using 4 stepper motors. I saw from previous searches that the torque required by the motors to move is Force times the wheel radius. COF = 0....
0
votes
1answer
57 views

How does a motor perform when it is given a load greater than its rated ability?

I have a 24V motor which is rated output of 250W at 2750 rpm (I calculated torque to be .87 Nm). If I have a wheel which needs 1 Nm of torque to retain a speed of 2750 rpm, I assume that the motor ...
0
votes
2answers
444 views

Why does torque increase with rotor current in an AC induction motor?

In my understanding, the EMF induced on the rotor of an AC induction motor induces a current, and the larger this current, the greater the rotor's torque will be. Could someone please explain: why ...
0
votes
1answer
339 views

Asynchronous induction motor, current in stator

My question is, how was \$ I_{stator} \$ found out? Y -connected 3-phase 4-pole induction motor has \$ R_r = 0.5\$ Ohm , and is supplied from a 480V l - l, 60Hz source. It is connected to a load ...
2
votes
1answer
75 views

DC motor characteristics and control

I don't have a lot of experience into detailed / calculated selection of DC motors based on their specs. Now, I'm starting to do it for robotics competitions as I'm progressing to more serious ones. ...
2
votes
1answer
135 views

servo selection for robotic arm [closed]

Hi i´m designing a robotic arm based on this idea of the NOVABOT I only want to change its structural parts by aluminum tubes. In this design 3D model it use the servo hs-311 wish have a max torque of ...
4
votes
2answers
276 views

Calculating total torque of stepper motor to lift and rotate some weight

I am going to design a system that would be control remotely. The system consist of stepper motor and solid cylinder rod of about 30 inches long and needs to lift about 0.5 lb/0.223 kg mean up to 90\$^...
0
votes
1answer
93 views

Power of motor needed to carry 2kg of weight at speed of 10 kmph [closed]

I need to make rc car which can carry a weight of 1-2 kg and can give speed upto 15kmph, can anyone please tell me what should be rpm and torque of motor for this purpose ? Thank You !
0
votes
2answers
584 views

Motor to spin slowly, low torque [closed]

I am trying to find a motor to use to spin a cardboard wheel to drop balls through a hole. I want this to happen pretty slowly, around 10rpm. It also needs almost no torque, as it is spinning ...
0
votes
1answer
94 views

Health index / performance curve of a motor

I am collecting daily data of motors that consists of vibration in three direction x,y,z , RPM, Temperature, kVAh, kWh, kVArh, average voltage (LL), average voltage (LN), average PF, average current ...
0
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2answers
322 views

DC motor speed and torque circuit equation, why is the current changed while voltage constant?

so i have a power window motor with spec the voltage 12V, continues torque 3 N.m, max load current 12A, and 90 RPM. the resistance is 2.5 ohm i understand that torque is correlated with current and ...
1
vote
2answers
2k views

Controlling the “amount” of regenerative braking (variable back torque?)

I have a question I have been wondering about for a while regarding regenerative braking on electric vehicles. If my understanding of electrical motors is correct In a perfect world with no friction ...
0
votes
1answer
71 views

Stepper Motor Drive Capability [closed]

I have the set up as shown in the picture below, The stepper Motor is supposed to drive the water Container Up and Down , stirring the solution in the container. My stepper Motor is a Nema 17 and I'm ...
0
votes
1answer
680 views

how powerful a stepper motor do i need

I had some nema 17 style stepper motors from an old prusia i3 and tried to use them to automate my blinds but noticed that they weren't powerful enough for my blinds. I used a basic newton meter to ...